OneLinersCommand workbench
Verified diagnostic signature

hint:\s*See PEP 668

pip refused to modify a Python installation owned by the operating-system package manager. Match this output from python-pip, then continue with sourced, read-only checks.

Confidence
high
Platforms
linux
Verified
2026-07-24
Recognized output

Signature matched locally

hint:\s*See PEP 668

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Likely causes

What usually produces this signal

  1. pip is running against Ubuntu or Debian system Python outside a virtual environment
  2. A project dependency was requested without first creating and selecting a venv
  3. A standalone Python application should be installed with pipx instead of system pip
  4. An automation script resolves /usr/bin/python3 rather than its intended isolated interpreter
Safe next checks

Collect evidence before changing the system

01

Show the current user and group identities

id

The output matches the expected target and exits without an error.

02

List environment variables alphabetically

env | sort

The output matches the expected target and exits without an error.

Related signals

Other output patterns from this error family

error:\s*externally-managed-environmentpip refused to modify a Python installation owned by the operating-system package manager.This environment is externally managedpip refused to modify a Python installation owned by the operating-system package manager.externally managed environmentpip refused to modify a Python installation owned by the operating-system package manager.--break-system-packagespip refused to modify a Python installation owned by the operating-system package manager.